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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Access to user system call parameters and results
4 *
5 * See asm-generic/syscall.h for function descriptions.
6 *
7 * Copyright (C) 2015 Mickaël Salaün <mic@digikod.net>
8 */
9
10#ifndef __UM_SYSCALL_GENERIC_H
11#define __UM_SYSCALL_GENERIC_H
12
13#include <asm/ptrace.h>
14#include <linux/err.h>
15#include <linux/sched.h>
16#include <sysdep/ptrace.h>
17
18static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
19{
20
21 return PT_REGS_SYSCALL_NR(regs);
22}
23
24static inline void syscall_set_nr(struct task_struct *task, struct pt_regs *regs, int nr)
25{
26 PT_REGS_SYSCALL_NR(regs) = nr;
27}
28
29static inline void syscall_rollback(struct task_struct *task,
30 struct pt_regs *regs)
31{
32 /* do nothing */
33}
34
35static inline long syscall_get_error(struct task_struct *task,
36 struct pt_regs *regs)
37{
38 const long error = regs_return_value(regs);
39
40 return IS_ERR_VALUE(error) ? error : 0;
41}
42
43static inline long syscall_get_return_value(struct task_struct *task,
44 struct pt_regs *regs)
45{
46 return regs_return_value(regs);
47}
48
49static inline void syscall_set_return_value(struct task_struct *task,
50 struct pt_regs *regs,
51 int error, long val)
52{
53 PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val);
54}
55
56static inline void syscall_get_arguments(struct task_struct *task,
57 struct pt_regs *regs,
58 unsigned long *args)
59{
60 const struct uml_pt_regs *r = ®s->regs;
61
62 *args++ = UPT_SYSCALL_ARG1(r);
63 *args++ = UPT_SYSCALL_ARG2(r);
64 *args++ = UPT_SYSCALL_ARG3(r);
65 *args++ = UPT_SYSCALL_ARG4(r);
66 *args++ = UPT_SYSCALL_ARG5(r);
67 *args = UPT_SYSCALL_ARG6(r);
68}
69
70static inline void syscall_set_arguments(struct task_struct *task,
71 struct pt_regs *regs,
72 const unsigned long *args)
73{
74 struct uml_pt_regs *r = ®s->regs;
75
76 UPT_SYSCALL_ARG1(r) = *args++;
77 UPT_SYSCALL_ARG2(r) = *args++;
78 UPT_SYSCALL_ARG3(r) = *args++;
79 UPT_SYSCALL_ARG4(r) = *args++;
80 UPT_SYSCALL_ARG5(r) = *args++;
81 UPT_SYSCALL_ARG6(r) = *args;
82}
83
84/* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */
85
86#endif /* __UM_SYSCALL_GENERIC_H */